1. Plug the iPod into the primary computer linked to that iPod, the first computer you synchronized it with unless you have designated another computer as the primary computer.2. Open iTunes and sync the iPod as normal.3. Remove the iPod, following the normal removal procedure. The iPod unlocks automatically as you remove it.

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Plug the iPod USB cable into the bottom of your iPod Nano. Plug the
other end of the USB cable into a free USB port on your Mac or PC
computer. Open the iTunes program by using the Dock on a Mac or the
Start menu on a PC.

Select your iPod Nano from the "Devices" list in the main iTunes
window. Click on the "Sync" button to make a connection between your
computer and your iPod Nano.

Click on the "Eject" symbol once the syncing process is complete.
Remove your iPod Nano from the USB cable. The iPod's lock code will now
be reset and you will be able to access all features again.

Navigate to the "Screen Lock" option in the iPod menu to lock your
iPod's screen again. Since your iPod's lock code was just reset, you
will be prompted to select a new four-digit code.

If you can't remember your lock code on your Nano, you will have to restore the Nano via iTunes, there is no other way around this, as there is no way to recover your lock code.Restoring your Nano will erase everything on the player, and restore it to factory defaults, after this is done you can restore all your files and settings to your Nano.Here is instructions on resoring your Nano in case you aren't sure how.http://support.apple.com/kb/HT1339?viewlocale=en_US

Connect your iPod to the primary computer you use it with (the first one iPod synced with), and open iTunes. When you disconnect iPod from the computer, it will no longer be locked. If you can't unlock iPod using either [the code or connecting it to the computer you use to manage its songs]. . . you can restore your iPod to factory settings using iPod Updater. Please note that this will erase all data on your iPod. Afterwards, you can add your music and data back to your iPod. If you want to change the primary computer that your iPod is associated with, do this: 1. Restore your iPod. Warning: The restore process cannot be undone. All of your songs and files will be deleted. Always make a backup of your important data. 2. Connect your iPod to the computer that you want to be the primary computer. 3. Open iTunes and synchronize. Apple also notes that company "representatives cannot unlock an iPod if you forget your combination. If you can't unlock your iPod and you don't have access to the primary computer, your only option is to restore the iPod, which will erase all music and data."